EP 0543160 A1 19930526 - Optical spectrum analyzer having adjustable sensitivity.
Title (en)
Optical spectrum analyzer having adjustable sensitivity.
Title (de)
Optischer Spektralanalysator mit einstellbarer Empfindlichkeit.
Title (fr)
Analyseur d'un spectre optique avec sensibilité ajustable.
Publication
Application
Priority
US 78857191 A 19911106
Abstract (en)
An optical spectrum analyzer (FIG. 2) is provided with a user selectable sensitivity (160). Required operating parameters are set in response to user selection of sensitivity (162) to permit measurement of an input light beam (12) at the selected sensitivity. Setting the required parameters includes setting a required gain of a video channel (48, 90, 92, 94, 96) to permit measurement of a specified maximum input signal and to provide the selected sensitivity, setting a required video bandwidth of the video channel (48, 90, 92, 94, 96) to provide the selected sensitivity at the required gain of the video channel (48, 90, 92, 94, 96) and setting a sweep rate to provide the selected sensitivity at the required video bandwidth. When the normal bandwidth of the video channel (48, 90, 92, 94, 96) is not adequate to provide the selected sensitivity, the electrical signal is passed through a digital filter having a filter coefficient (FILTER COEFFICIENT) set to provide the required video bandwidth. A peak detector (90) is incorporated in the video channel (48, 90, 92, 94, 96) to accurately measure signal amplitudes in a fast scanning condition. <IMAGE> <IMAGE>
IPC 1-7
IPC 8 full level
G01J 3/18 (2006.01); G01J 3/28 (2006.01); G01J 3/32 (2006.01); G01J 3/06 (2006.01); G01J 3/30 (2006.01)
CPC (source: EP US)
G01J 3/28 (2013.01 - EP US); G01J 3/2889 (2013.01 - EP US); G01J 3/30 (2013.01 - EP US); G01J 2003/062 (2013.01 - EP US); G01J 2003/283 (2013.01 - EP US); G01J 2003/2893 (2013.01 - EP US)
Citation (search report)
- [X] US 4974209 A 19901127 - HOULT ROBERT A [US]
- [A] US 4322807 A 19820330 - CHAMRAN MORTEZA M, et al
- [A] GB 2151053 A 19850710 - SHIMADZU CORP
- [A] EP 0096316 A1 19831221 - KOEZPONTI ELELMISZERIPARI [HU]
- [A] AU 563817 B2 19870723 - VARIAN TECHTRON PTY LTD
- [A] DE 2839949 A1 19800327 - ZEISS CARL FA
- [A] PATENT ABSTRACTS OF JAPAN vol. 10, no. 80 (P-441)(2137) 29 March 1986 & JP-A-60 218 041 ( HITACHI )
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 5177560 A 19930105; DE 69208219 D1 19960321; DE 69208219 T2 19960627; DE 69225612 D1 19980625; DE 69225612 T2 19980917; EP 0543160 A1 19930526; EP 0543160 B1 19960207; EP 0647837 A1 19950412; EP 0647837 B1 19980520; JP 3731902 B2 20060105; JP H0658811 A 19940304
DOCDB simple family (application)
US 78857191 A 19911106; DE 69208219 T 19921020; DE 69225612 T 19921020; EP 92117933 A 19921020; EP 94119858 A 19921020; JP 32274492 A 19921106